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160 lines
3.8 KiB
160 lines
3.8 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_TIMENS_H |
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#define _LINUX_TIMENS_H |
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#include <linux/sched.h> |
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#include <linux/nsproxy.h> |
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#include <linux/ns_common.h> |
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#include <linux/err.h> |
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struct user_namespace; |
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extern struct user_namespace init_user_ns; |
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struct timens_offsets { |
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struct timespec64 monotonic; |
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struct timespec64 boottime; |
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}; |
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struct time_namespace { |
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struct user_namespace *user_ns; |
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struct ucounts *ucounts; |
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struct ns_common ns; |
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struct timens_offsets offsets; |
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struct page *vvar_page; |
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/* If set prevents changing offsets after any task joined namespace. */ |
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bool frozen_offsets; |
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} __randomize_layout; |
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extern struct time_namespace init_time_ns; |
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#ifdef CONFIG_TIME_NS |
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extern int vdso_join_timens(struct task_struct *task, |
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struct time_namespace *ns); |
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extern void timens_commit(struct task_struct *tsk, struct time_namespace *ns); |
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static inline struct time_namespace *get_time_ns(struct time_namespace *ns) |
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{ |
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refcount_inc(&ns->ns.count); |
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return ns; |
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} |
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struct time_namespace *copy_time_ns(unsigned long flags, |
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struct user_namespace *user_ns, |
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struct time_namespace *old_ns); |
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void free_time_ns(struct time_namespace *ns); |
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void timens_on_fork(struct nsproxy *nsproxy, struct task_struct *tsk); |
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struct vdso_data *arch_get_vdso_data(void *vvar_page); |
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static inline void put_time_ns(struct time_namespace *ns) |
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{ |
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if (refcount_dec_and_test(&ns->ns.count)) |
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free_time_ns(ns); |
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} |
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void proc_timens_show_offsets(struct task_struct *p, struct seq_file *m); |
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struct proc_timens_offset { |
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int clockid; |
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struct timespec64 val; |
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}; |
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int proc_timens_set_offset(struct file *file, struct task_struct *p, |
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struct proc_timens_offset *offsets, int n); |
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static inline void timens_add_monotonic(struct timespec64 *ts) |
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{ |
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struct timens_offsets *ns_offsets = ¤t->nsproxy->time_ns->offsets; |
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*ts = timespec64_add(*ts, ns_offsets->monotonic); |
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} |
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static inline void timens_add_boottime(struct timespec64 *ts) |
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{ |
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struct timens_offsets *ns_offsets = ¤t->nsproxy->time_ns->offsets; |
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*ts = timespec64_add(*ts, ns_offsets->boottime); |
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} |
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static inline u64 timens_add_boottime_ns(u64 nsec) |
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{ |
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struct timens_offsets *ns_offsets = ¤t->nsproxy->time_ns->offsets; |
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return nsec + timespec64_to_ns(&ns_offsets->boottime); |
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} |
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static inline void timens_sub_boottime(struct timespec64 *ts) |
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{ |
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struct timens_offsets *ns_offsets = ¤t->nsproxy->time_ns->offsets; |
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*ts = timespec64_sub(*ts, ns_offsets->boottime); |
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} |
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ktime_t do_timens_ktime_to_host(clockid_t clockid, ktime_t tim, |
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struct timens_offsets *offsets); |
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static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim) |
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{ |
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struct time_namespace *ns = current->nsproxy->time_ns; |
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if (likely(ns == &init_time_ns)) |
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return tim; |
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return do_timens_ktime_to_host(clockid, tim, &ns->offsets); |
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} |
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#else |
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static inline int vdso_join_timens(struct task_struct *task, |
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struct time_namespace *ns) |
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{ |
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return 0; |
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} |
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static inline void timens_commit(struct task_struct *tsk, |
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struct time_namespace *ns) |
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{ |
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} |
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static inline struct time_namespace *get_time_ns(struct time_namespace *ns) |
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{ |
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return NULL; |
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} |
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static inline void put_time_ns(struct time_namespace *ns) |
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{ |
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} |
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static inline |
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struct time_namespace *copy_time_ns(unsigned long flags, |
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struct user_namespace *user_ns, |
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struct time_namespace *old_ns) |
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{ |
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if (flags & CLONE_NEWTIME) |
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return ERR_PTR(-EINVAL); |
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return old_ns; |
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} |
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static inline void timens_on_fork(struct nsproxy *nsproxy, |
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struct task_struct *tsk) |
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{ |
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return; |
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} |
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static inline void timens_add_monotonic(struct timespec64 *ts) { } |
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static inline void timens_add_boottime(struct timespec64 *ts) { } |
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static inline u64 timens_add_boottime_ns(u64 nsec) |
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{ |
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return nsec; |
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} |
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static inline void timens_sub_boottime(struct timespec64 *ts) { } |
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static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim) |
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{ |
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return tim; |
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} |
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#endif |
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#endif /* _LINUX_TIMENS_H */
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